diff options
Diffstat (limited to 'drivers/net/ntb_netdev.c')
| -rw-r--r-- | drivers/net/ntb_netdev.c | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/drivers/net/ntb_netdev.c b/drivers/net/ntb_netdev.c new file mode 100644 index 0000000..ed947dd --- /dev/null +++ b/drivers/net/ntb_netdev.c @@ -0,0 +1,408 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2012 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * BSD LICENSE + * + * Copyright(c) 2012 Intel Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copy + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Intel PCIe NTB Network Linux driver + * + * Contact Information: + * Jon Mason <jon.mason@intel.com> + */ +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/ntb.h> + +#define NTB_NETDEV_VER "0.7" + +MODULE_DESCRIPTION(KBUILD_MODNAME); +MODULE_VERSION(NTB_NETDEV_VER); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("Intel Corporation"); + +struct ntb_netdev { + struct list_head list; + struct pci_dev *pdev; + struct net_device *ndev; + struct ntb_transport_qp *qp; +}; + +#define NTB_TX_TIMEOUT_MS 1000 +#define NTB_RXQ_SIZE 100 + +static LIST_HEAD(dev_list); + +static void ntb_netdev_event_handler(void *data, int status) +{ + struct net_device *ndev = data; + struct ntb_netdev *dev = netdev_priv(ndev); + + netdev_dbg(ndev, "Event %x, Link %x\n", status, + ntb_transport_link_query(dev->qp)); + + /* Currently, only link status event is supported */ + if (status) + netif_carrier_on(ndev); + else + netif_carrier_off(ndev); +} + +static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data, + void *data, int len) +{ + struct net_device *ndev = qp_data; + struct sk_buff *skb; + int rc; + + skb = data; + if (!skb) + return; + + netdev_dbg(ndev, "%s: %d byte payload received\n", __func__, len); + + skb_put(skb, len); + skb->protocol = eth_type_trans(skb, ndev); + skb->ip_summed = CHECKSUM_NONE; + + if (netif_rx(skb) == NET_RX_DROP) { + ndev->stats.rx_errors++; + ndev->stats.rx_dropped++; + } else { + ndev->stats.rx_packets++; + ndev->stats.rx_bytes += len; + } + + skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN); + if (!skb) { + ndev->stats.rx_errors++; + ndev->stats.rx_frame_errors++; + return; + } + + rc = ntb_transport_rx_enqueue(qp, skb, skb->data, ndev->mtu + ETH_HLEN); + if (rc) { + dev_kfree_skb(skb); + ndev->stats.rx_errors++; + ndev->stats.rx_fifo_errors++; + } +} + +static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data, + void *data, int len) +{ + struct net_device *ndev = qp_data; + struct sk_buff *skb; + + skb = data; + if (!skb || !ndev) + return; + + if (len > 0) { + ndev->stats.tx_packets++; + ndev->stats.tx_bytes += skb->len; + } else { + ndev->stats.tx_errors++; + ndev->stats.tx_aborted_errors++; + } + + dev_kfree_skb(skb); +} + +static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb, + struct net_device *ndev) +{ + struct ntb_netdev *dev = netdev_priv(ndev); + int rc; + + netdev_dbg(ndev, "%s: skb len %d\n", __func__, skb->len); + + rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len); + if (rc) + goto err; + + return NETDEV_TX_OK; + +err: + ndev->stats.tx_dropped++; + ndev->stats.tx_errors++; + return NETDEV_TX_BUSY; +} + +static int ntb_netdev_open(struct net_device *ndev) +{ + struct ntb_netdev *dev = netdev_priv(ndev); + struct sk_buff *skb; + int rc, i, len; + + /* Add some empty rx bufs */ + for (i = 0; i < NTB_RXQ_SIZE; i++) { + skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN); + if (!skb) { + rc = -ENOMEM; + goto err; + } + + rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data, + ndev->mtu + ETH_HLEN); + if (rc == -EINVAL) + goto err; + } + + netif_carrier_off(ndev); + ntb_transport_link_up(dev->qp); + + return 0; + +err: + while ((skb = ntb_transport_rx_remove(dev->qp, &len))) + dev_kfree_skb(skb); + return rc; +} + +static int ntb_netdev_close(struct net_device *ndev) +{ + struct ntb_netdev *dev = netdev_priv(ndev); + struct sk_buff *skb; + int len; + + ntb_transport_link_down(dev->qp); + + while ((skb = ntb_transport_rx_remove(dev->qp, &len))) + dev_kfree_skb(skb); + + return 0; +} + +static int ntb_netdev_change_mtu(struct net_device *ndev, int new_mtu) +{ + struct ntb_netdev *dev = netdev_priv(ndev); + struct sk_buff *skb; + int len, rc; + + if (new_mtu > ntb_transport_max_size(dev->qp) - ETH_HLEN) + return -EINVAL; + + if (!netif_running(ndev)) { + ndev->mtu = new_mtu; + return 0; + } + + /* Bring down the link and dispose of posted rx entries */ + ntb_transport_link_down(dev->qp); + + if (ndev->mtu < new_mtu) { + int i; + + for (i = 0; (skb = ntb_transport_rx_remove(dev->qp, &len)); i++) + dev_kfree_skb(skb); + + for (; i; i--) { + skb = netdev_alloc_skb(ndev, new_mtu + ETH_HLEN); + if (!skb) { + rc = -ENOMEM; + goto err; + } + + rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data, + new_mtu + ETH_HLEN); + if (rc) { + dev_kfree_skb(skb); + goto err; + } + } + } + + ndev->mtu = new_mtu; + + ntb_transport_link_up(dev->qp); + + return 0; + +err: + ntb_transport_link_down(dev->qp); + + while ((skb = ntb_transport_rx_remove(dev->qp, &len))) + dev_kfree_skb(skb); + + netdev_err(ndev, "Error changing MTU, device inoperable\n"); + return rc; +} + +static const struct net_device_ops ntb_netdev_ops = { + .ndo_open = ntb_netdev_open, + .ndo_stop = ntb_netdev_close, + .ndo_start_xmit = ntb_netdev_start_xmit, + .ndo_change_mtu = ntb_netdev_change_mtu, + .ndo_set_mac_address = eth_mac_addr, +}; + +static void ntb_get_drvinfo(struct net_device *ndev, + struct ethtool_drvinfo *info) +{ + struct ntb_netdev *dev = netdev_priv(ndev); + + strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); + strlcpy(info->version, NTB_NETDEV_VER, sizeof(info->version)); + strlcpy(info->bus_info, pci_name(dev->pdev), sizeof(info->bus_info)); +} + +static int ntb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) +{ + cmd->supported = SUPPORTED_Backplane; + cmd->advertising = ADVERTISED_Backplane; + cmd->speed = SPEED_UNKNOWN; + ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN); + cmd->duplex = DUPLEX_FULL; + cmd->port = PORT_OTHER; + cmd->phy_address = 0; + cmd->transceiver = XCVR_DUMMY1; + cmd->autoneg = AUTONEG_ENABLE; + cmd->maxtxpkt = 0; + cmd->maxrxpkt = 0; + + return 0; +} + +static const struct ethtool_ops ntb_ethtool_ops = { + .get_drvinfo = ntb_get_drvinfo, + .get_link = ethtool_op_get_link, + .get_settings = ntb_get_settings, +}; + +static const struct ntb_queue_handlers ntb_netdev_handlers = { + .tx_handler = ntb_netdev_tx_handler, + .rx_handler = ntb_netdev_rx_handler, + .event_handler = ntb_netdev_event_handler, +}; + +static int ntb_netdev_probe(struct pci_dev *pdev) +{ + struct net_device *ndev; + struct ntb_netdev *dev; + int rc; + + ndev = alloc_etherdev(sizeof(struct ntb_netdev)); + if (!ndev) + return -ENOMEM; + + dev = netdev_priv(ndev); + dev->ndev = ndev; + dev->pdev = pdev; + BUG_ON(!dev->pdev); + ndev->features = NETIF_F_HIGHDMA; + + ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; + + ndev->hw_features = ndev->features; + ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS); + + random_ether_addr(ndev->perm_addr); + memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len); + + ndev->netdev_ops = &ntb_netdev_ops; + SET_ETHTOOL_OPS(ndev, &ntb_ethtool_ops); + + dev->qp = ntb_transport_create_queue(ndev, pdev, &ntb_netdev_handlers); + if (!dev->qp) { + rc = -EIO; + goto err; + } + + ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN; + + rc = register_netdev(ndev); + if (rc) + goto err1; + + list_add(&dev->list, &dev_list); + dev_info(&pdev->dev, "%s created\n", ndev->name); + return 0; + +err1: + ntb_transport_free_queue(dev->qp); +err: + free_netdev(ndev); + return rc; +} + +static void ntb_netdev_remove(struct pci_dev *pdev) +{ + struct net_device *ndev; + struct ntb_netdev *dev; + + list_for_each_entry(dev, &dev_list, list) { + if (dev->pdev == pdev) + break; + } + if (dev == NULL) + return; + + ndev = dev->ndev; + + unregister_netdev(ndev); + ntb_transport_free_queue(dev->qp); + free_netdev(ndev); +} + +static struct ntb_client ntb_netdev_client = { + .driver.name = KBUILD_MODNAME, + .driver.owner = THIS_MODULE, + .probe = ntb_netdev_probe, + .remove = ntb_netdev_remove, +}; + +static int __init ntb_netdev_init_module(void) +{ + int rc; + + rc = ntb_register_client_dev(KBUILD_MODNAME); + if (rc) + return rc; + return ntb_register_client(&ntb_netdev_client); +} +module_init(ntb_netdev_init_module); + +static void __exit ntb_netdev_exit_module(void) +{ + ntb_unregister_client(&ntb_netdev_client); + ntb_unregister_client_dev(KBUILD_MODNAME); +} +module_exit(ntb_netdev_exit_module); |
